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finding resolution

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I am doing a program with GLUT on the windows platform, and my mouse function is used to plot vertices. THe problem with this is that it does it in pixels, so I have to do SCREENHEIGHT - y to get the correct coordinates. The problem arises when I try to run this program on a machine that has a different resolution. I''m in 1024x768, but if i run it on a monitor that is in 800x600 it won''t work properly. Can someone tell me how to get the current resolution?

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